package com.itheima.reggie.fliter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class loginCheckFilter implements Filter {

    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //获取本次请求的URl
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}",requestURI);

        //定义不需要处理的请求路径
        String[]urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };

        //判断本次请求是否需要处理
         boolean check = check(urls,requestURI);

         //如果不需要处理，直接方形
        if (check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

            //判断登录状态，如果已登录，则直接方形
        if (request.getSession().getAttribute("employee")!=null) {
            log.info("用户已登录，用户id为:{}", request.getSession().getAttribute("employee"));

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request, response);
            return;
        }

            if(request.getSession().getAttribute("user") != null){
                log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));
                Long idd=(Long)request.getSession().getAttribute("user");
                BaseContext.setCurrentId(idd); //将正在登陆的用户的ID绑定到了当前的线程对象
                filterChain.doFilter(request,response);
                return;
        }

        //如果未登录，返回未登录结果。通过输入流方式向客户端页面响应数据
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

       // log.info("拦截到请求:{}",request.getRequestURI());
       // filterChain.doFilter(request,response);

    }

    /**
     * 匹配路径，检查本次请求是否方形
     * @param urls
     * @param requestURI
     * @return
     */
    private boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
